Widescreen and High Definition Videos

Hot on the heels of YouTube's upgrade to High Quality videos, the site now lets users upgrade and viewers watch widescreen videos, as well as high definition videos. The default video player is now widescreen, and any widescreen videos you upload will display at the wider aspect ratio. You can also upload videos up to 720p resolution -- that's 1280 pixels wide by 720 pixels tall. When the high definition option is available, viewers need only click the HD option to view in full high resolution.

Video Annotations

Here's something relatively new on the YouTube site. You can now "annotate" your videos, by adding Pop Up Video-like word balloons and text boxes, as well as onscreen overlays that link to other YouTube videos. To add annotations, upload your video as normal and then go to your uploaded videos page; click the Edit Annotations button for the video in question and then do your thing!